Utility knife



FIG. 1 is a right side view of the utility knife;

FIG. 2 is a left side view thereof;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a rear end view thereof; and,

FIG. 6 is a front end view thereof. 

The ornamental design for a utility knife, as shown and described. 